Battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack, the battery pack comprises a battery pack, a battery box and a sensor assembly, the battery pack comprises a plurality of batteries; the battery box comprises a supporting plate, a bottom plate and a frame, the supporting plate is located on the side, provided with the anti-explosion valve, of the battery, the bottom plate is located on the side, away from the battery, of the supporting plate, and an exhaust channel is formed between the supporting plate and the bottom plate; a plurality of weak areas are formed on the supporting plate, orthographic projections of the explosion-proof valve and the weak areas on the bottom plate are at least partially overlapped, pressure relief holes communicated with the exhaust channel and the outside of the battery box are formed in the frame, the total area of the pressure relief holes is M, and the unit of M is mm < 2 >; the space where a sensor probe of the sensor assembly is located is communicated with the exhaust channel, the shortest distance between the sensor probe and the pressure relief hole in the direction parallel to the bottom plate is L, the unit of L is mm, and the ratio of L to M meets the condition that L / M is larger than or equal to 0.001 and smaller than or equal to 0.06. The sensor assembly has high sensitivity, safety and stability.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] Battery packs typically contain sensor components that detect parameters such as gas composition, temperature, and pressure within the pack to determine if thermal runaway has occurred. However, in related technologies, these sensor components are usually located in the electrical compartment of the battery pack or near the battery's explosion-proof valve, resulting in low sensitivity or the sensor components being easily damaged in the event of thermal runaway.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] This invention provides a battery pack that solves the technical problems of low sensitivity of sensor components and rapid damage to sensor components when the battery experiences thermal runaway.

[0005] The battery pack includes:

[0006] The battery pack consists of multiple batteries, each equipped with an explosion-proof valve.

[0007] The battery box includes a support plate, a base plate, and a frame. The frame is set along the edge of the base plate to form a receiving space for accommodating the battery pack. The support plate is located on the side of the battery where the explosion-proof valve is installed, and the base plate is located on the side of the support plate away from the battery. The base plate and the support plate are opposite to each other and spaced apart, and an exhaust channel is formed between the support plate and the base plate.

[0008] The support plate has multiple weak zones, and the orthographic projections of the explosion-proof valve and the weak zones on the base plate at least partially overlap. One or more pressure relief holes are formed on the frame, connecting the exhaust channel and the outside of the battery box. The total area of ​​the one or more pressure relief holes is M, where M is in mm. 2 ;

[0009] The sensor assembly includes a sensor probe. The space where the sensor probe is located is connected to the exhaust channel. The shortest distance between the sensor probe and the pressure relief hole in the direction parallel to the base plate is L, where L is in mm. The ratio of L to M satisfies 0.001≤L / M≤0.06.

[0010] In this application, when the battery experiences thermal runaway, the high-temperature, high-pressure gas inside the battery is released through the explosion-proof valve and enters the exhaust channel through the weak area on the support plate. The gas in the exhaust channel can be released to the outside of the battery pack through the pressure relief hole. The sensor assembly can determine whether the battery has experienced thermal runaway by detecting parameters such as gas concentration, temperature, and pressure. The area of ​​the pressure relief hole determines the exhaust speed during pressure relief. A larger area results in faster gas flow, but correspondingly, less time for the sensor probe to detect the gas, which can easily lead to a decrease in the sensitivity of the sensor assembly. Conversely, a smaller area results in a slower exhaust speed, poor pressure relief capacity of the battery pack, and a decrease in battery pack safety. Furthermore, the shortest distance L between the sensor probe and the pressure relief hole in the direction parallel to the base plate determines the contact time between the sensor probe and the gas flow, as well as the gas concentration. During pressure relief, all gas will eventually be discharged from the pressure relief hole. Therefore, if L is too large, the sensor probe may deviate from the gas flow path and fail to detect the gas. If L is too small, the high-pressure, high-temperature gas flow concentrated around the pressure relief hole may damage the sensor probe. This application sets L / M to an appropriate value, which can ensure the sensitivity of the sensor assembly while reducing the risk of airflow damaging the sensor probe and improving the safety and stability of the sensor assembly.

[0011] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0012] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures.

[0013] in:

[0014] Figure 1 This is a schematic diagram of the structure of an exemplary embodiment of the battery pack disclosed herein;

[0015] Figure 2 A top view of an exemplary embodiment of the battery pack disclosed herein;

[0016] Figure 3 for Figure 1 A magnified view of a portion AA of the battery pack shown;

[0017] Figure 4 for Figure 3 The battery pack shown is a cross-sectional view along the dashed line BB;

[0018] Figure 5This is a schematic diagram of the flow guide in an exemplary embodiment of the battery pack disclosed herein;

[0019] Figure 6 This is a simplified structural diagram of an exemplary embodiment of the battery pack disclosed herein;

[0020] Figure 7 This is a schematic diagram of another exemplary embodiment of the battery pack disclosed herein;

[0021] Figure 8 This is a schematic diagram of another exemplary embodiment of the battery pack disclosed herein.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Battery pack; 10. Reinforcing beam; 11. Battery; 111. Explosion-proof valve; 12. Buffer pad; 2. Battery box; 21. Support plate; 211. Weak area; 22. Base plate; 23. Frame; 231. Pressure relief hole; 3. Exhaust channel; 4. Sensor assembly; 41. Sensor probe; 42. Sensor body; 5. Cavity; 6. Vent; 7. Flow guide; 701. First flow guide; 702. Second flow guide; 71. First connection port; 72. Second connection port; 73. Isolation plate; 731. Flow guide opening; 8. Flow guide channel; 81. First flow guide channel; 82. Second flow guide channel; 9. Accommodation space; 91. First accommodation space; 92. Second accommodation space. Detailed Implementation

[0024] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0025] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0026] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0027] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of an element or feature being connected to one or more "upper," "lower," "inner," or "outer" elements, it can be directly connected to one or more "upper," "lower," "inner," or "outer" elements, or indirectly connected to one or more "upper," "lower," "inner," or "outer" elements through intermediate elements.

[0028] like Figure 1-6 As shown, Figure 1 This is a schematic diagram of the structure of an exemplary embodiment of the battery pack disclosed herein. Figure 2 This is a top view of an exemplary embodiment of the battery pack disclosed herein. Figure 3 for Figure 1 The image shown is a magnified view of a portion AA of the battery pack. Figure 4 for Figure 3 The cross-sectional view of the battery pack shown is along the dashed line BB. Figure 5 This is a schematic diagram of the flow guide in an exemplary embodiment of the battery pack disclosed herein. Figure 6 This is a simplified structural diagram of an exemplary embodiment of the battery pack disclosed herein. Figure 1-4 The battery pack shown does not include the battery assembly, support plate, or base plate.

[0029] In this exemplary embodiment, the battery pack includes: a battery group 1, a battery box 2, and a sensor assembly 4. The battery group 1 includes multiple batteries 11, and each battery 11 is provided with an explosion-proof valve 111. The battery box 2 includes a support plate 21, a base plate 22, and a frame 23. The frame 23 is provided along the edge of the base plate 22 to form a receiving space 9 for accommodating the battery group 1. The support plate 21 is located on the side of the battery 11 where the explosion-proof valve 111 is provided, and the base plate 22 is located on the side of the support plate 21 away from the battery 11. The base plate 22 is opposite to and spaced apart from the support plate 21, and an exhaust channel 3 is formed between the support plate 21 and the base plate 22. The support plate 21 has multiple weak areas 211, and the orthographic projection of the explosion-proof valve 111 on the base plate 22 and the orthographic projection of the weak areas 211 on the base plate 22 at least partially overlap. The frame 23 has one or more pressure relief holes 231 communicating between the exhaust channel 3 and the outside of the battery box 2. The total area of ​​the one or more pressure relief holes 231 is M, where M is in mm. 2 The sensor assembly 4 includes a sensor probe 41. The space where the sensor probe 41 is located is connected to the exhaust channel 3. The shortest distance between the sensor probe 41 and the pressure relief hole 231 in the direction parallel to the base plate 22 is L. The unit of L is mm. The ratio of L to M satisfies 0.001≤L / M≤0.06.

[0030] In this exemplary embodiment, when thermal runaway occurs in the battery, the high-temperature, high-pressure gas inside the battery 11 is released through the explosion-proof valve 111 and enters the exhaust channel 3 through the weak area 211 on the support plate 21. The gas in the exhaust channel 3 can be released to the outside of the battery box 2 through the pressure relief hole 231. The sensor assembly 4 can determine whether thermal runaway has occurred in the battery 11 by detecting parameters such as gas concentration, temperature, and pressure. The area of ​​the pressure relief hole 231 determines the exhaust speed during pressure relief. The larger the area of ​​the pressure relief hole 231, the faster the airflow is discharged. Correspondingly, the time left for the sensor probe 41 to detect is shorter, which can easily cause a decrease in the sensitivity of the sensor assembly 4. If the area of ​​the pressure relief hole 231 is too small, the exhaust speed is too slow, the battery pack has poor pressure relief capacity, and thus the safety of the battery pack is reduced. Furthermore, the shortest distance L between the sensor probe 41 and the pressure relief hole 231 in the direction parallel to the base plate 22 determines the contact time between the sensor probe 41 and the airflow, as well as the gas concentration. During pressure relief, the gas will eventually be discharged from the pressure relief hole 231. Therefore, if L is too large, the sensor probe 41 may deviate from the airflow path and fail to detect the gas. If L is too small, the high-speed, high-temperature airflow concentrated around the pressure relief hole 231 may damage the sensor probe 231. This application sets L / M to an appropriate value, which can ensure the sensitivity of the sensor assembly 4 while reducing the risk of airflow damaging the sensor probe 41 and improving the safety and stability of the sensor assembly 4.

[0031] In this exemplary embodiment, as Figure 1-6As shown, the orthographic projection of the sensor probe 41 on the base plate 22 and the orthographic projection of the explosion-proof valve 111 on the base plate 22 do not overlap. This arrangement can prevent the high-temperature and high-pressure gas ejected from the explosion-proof valve 111 from directly impacting the sensor probe 41, thereby preventing damage to the sensor probe 41. In this exemplary embodiment, the explosion-proof valve 111 can be formed by a groove located on the battery housing, or the explosion-proof valve 111 can be a thinned area formed by stamping on the battery housing. In addition, the explosion-proof valve 111 can also be a patch attached to the explosion-proof opening.

[0032] In this exemplary embodiment, as Figure 1-6 As shown, the frame 23 can be a hollow structure, forming a cavity 5. The cavity 5 is connected to the exhaust channel 3, and the pressure relief hole 231 is connected between the outside of the battery box 2 and the cavity 5. The gas in the exhaust channel 3 can first enter the cavity 5 and then be discharged from the battery box through the pressure relief hole 231.

[0033] In this exemplary embodiment, as Figure 1-6 As shown, the cavity 5 and the exhaust channel 3 are connected through one or more vents 6, and the total area of ​​the vents 6 is greater than the total area of ​​the pressure relief holes 231. The area of ​​the vents 6 affects the speed at which gas enters the cavity 5 from the exhaust channel 3. In this exemplary embodiment, the area of ​​the vents 6 is set to be relatively large, thereby ensuring that the gas can enter the cavity 5 relatively smoothly.

[0034] In this exemplary embodiment, as Figure 1-6 As shown, the battery pack may further include: a flow guide 7, which is located inside the battery box 2. A flow guide channel 8 is formed inside the flow guide 7. A first connection port 71 and a second connection port 72 that communicate with the flow guide channel 8 are also formed on the flow guide 7. The first connection port 71 communicates with the cavity 5, and the second connection port 72 communicates with the exhaust channel 3. The second connection port 72 forms a vent 6.

[0035] In this exemplary embodiment, as Figure 1-6As shown, the flow guide 7 may include: a partition plate 73, which divides the flow guide channel 8 into a first flow guide channel 81 and a second flow guide channel 82. The partition plate 73 has a flow guide opening 731 for connecting the first flow guide channel 81 and the second flow guide channel 82. A vent 6 connects to the side of the second flow guide channel 82 away from the first flow guide channel 81, and a first connection port 71 connects to the side of the first flow guide channel 81 in a first direction X. The distribution directions of the first flow guide channel 81 and the second flow guide channel 82 intersect with the first direction X. For example, the first direction X may be parallel to the base plate, and the distribution directions of the first flow guide channel 81 and the second flow guide channel 82 may be perpendicular to the base plate. In a single flow guide 7, the area of ​​the orthographic projection of the flow guide opening 731 onto the base plate 22 is smaller than the area of ​​the orthographic projection of the vent 6 onto the base plate 22. Gas located in the exhaust channel 3 first enters the second guide channel 82 through the vent 6. Gas in the second guide channel 82 then enters the first guide channel 81 through the guide opening 731. Gas in the first guide channel 81 changes direction and enters the cavity 5 through the first connection port 71. During battery thermal runaway, the battery not only releases gas into the exhaust channel 3 through the pressure relief valve but also releases electrolyte and other substances. This exemplary embodiment sets the area of ​​the guide opening 731 to be relatively small and sets the vent 6 and the first connection port 71 to have different orientations. This arrangement can buffer and block the electrolyte and other substances ejected from the battery through the internal structure of the guide member 7, thereby reducing the risk of electrolyte damaging external components of the battery case.

[0036] In this exemplary embodiment, as Figure 1-6 As shown, the first flow channel 81 is located on the side of the second flow channel 82 away from the base plate 22. The sensor assembly 4 also includes a sensor body 42, which is disposed on the side of the flow guide 7 away from the base plate 22. The sensor probe 41 is at least partially located in the first flow channel 81. In this exemplary embodiment, the area of ​​the flow opening 731 is smaller than that of the vent 6. This arrangement can reduce the risk of electrolyte entering the first flow channel 81. Correspondingly, in this exemplary embodiment, the sensor probe 41 is at least partially disposed in the first flow channel 81, thereby reducing the risk of electrolyte damaging the sensor probe 41.

[0037] In this exemplary embodiment, as Figure 1-6 As shown, the battery pack may include one or more flow guides 7, which are located at the corner of the battery box 2 on one side of the base plate 22. This arrangement ensures that the flow guides 7 do not occupy the space where the battery pack is located, thereby improving the energy density of the battery pack. Furthermore, it should be noted that in this exemplary embodiment, only one flow guide is equipped with a sensor assembly 4.

[0038] In this exemplary embodiment, as Figure 1-6As shown, the cavity 5 in the frame 23 extends along the extension direction of the frame 23. The battery box 2 includes multiple corners on one side of the base plate 22, and a guide 7 is provided at each corner. In this exemplary embodiment, a guide 7 is provided at each corner. The gas in the exhaust channel 3 enters the cavity 5 of the frame through each guide 7. The gas entering the cavity 5 extends along the extension direction of the cavity ( Figure 2 (As indicated by the middle arrow) The gas flows to the location of the pressure relief hole 231, and then the gas can be discharged from the battery box through the pressure relief hole 231. Since the gas in the exhaust channel 3 enters the cavity 5 through multiple guides 7, the gas concentration in the space where the sensor probe 41 is located will decrease, so L needs to be reduced. Accordingly, 0.0012≤L / M≤0.05. For example, L / M can be equal to 0.0012, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.05, etc.

[0039] It should be understood that in other exemplary embodiments, the battery pack may also have the guide 7 only located at some of the corners. For example... Figure 7 The diagram shown is a structural schematic of another exemplary embodiment of the battery pack disclosed herein. One or more flow guides 7 include a first flow guide 701, and among all flow guides 7, the second connection port 72 on the first flow guide 701 is closest to the pressure relief hole 231. This setting can reduce the path length of gas discharge and reduce the pressure relief delay. At the same time, since the gas in the exhaust channel 3 is discharged only from the first guide member 701, the gas velocity and concentration at the location of the sensor probe 41 are relatively large, and the sensor assembly 4 can detect the gas parameters more easily. In order to avoid damage to the sensor probe 41 by high temperature and high pressure gas, this exemplary embodiment can set L to be larger. Accordingly, L / M satisfies 0.0022≤L / M≤0.06. For example, L / M can be equal to 0.0022, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, etc.

[0040] like Figure 8The diagram shown is a structural schematic of another exemplary embodiment of the battery pack disclosed herein. One or more flow guides 7 may further include a second flow guide 702. Among all flow guides 7, the second connection port 72 on the second flow guide 702 is furthest from the pressure relief hole 231. Gas at the furthest position from the pressure relief hole 231 is difficult to discharge, which can easily lead to the accumulation of high-temperature, high-pressure gas in the exhaust channel 3, thereby further expanding the thermal runaway range of the battery pack. This exemplary embodiment provides a second flow guide 702 at the furthest position from the pressure relief hole 231. Gas in the exhaust channel 3 can enter the cavity 5 through the second flow guide 702, and then flow into the pressure relief hole 231 through the cavity 5. This arrangement facilitates the smooth discharge of gas at the furthest position from the pressure relief hole 231. Since the gas in the exhaust channel 3 enters the cavity 5 through multiple guides 7, the gas concentration in the space where the sensor probe 41 is located will decrease. Therefore, L needs to be reduced. Accordingly, L / M satisfies 0.0018≤L / M≤0.055. For example, L / M can be equal to 0.0018, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.05, 0.055, etc.

[0041] In this exemplary embodiment, as Figure 1-8 As shown, the pressure relief hole 231 can be a large hole. It should be understood that in other exemplary embodiments, the pressure relief hole 231 can also be composed of multiple small holes. The pressure relief hole can also be implemented by setting a weak area on the frame, scoring, welding an explosion-proof valve patch, or installing a one-way valve-type pressure relief valve (i.e., after the pressure reaches a threshold, the spring in the explosion-proof valve is opened; after the pressure recovers, the spring returns to its original position, closing the pressure relief hole). The larger the total area M of the pressure relief hole 231, the faster the airflow discharge speed, and the shorter the detection time for the sensor probe 41, which can easily cause a decrease in the sensitivity of the sensor assembly 4. If M is too small, the exhaust speed is too slow, and the safety of the battery pack decreases. In this exemplary embodiment, 500mm... 2 ≤M≤3000mm 2 For example, M can be equal to 500mm 2 600mm 2 700mm 2 800mm 2 900mm 2 1000mm 2 1500mm 2 2000mm 2 2500mm 2 3000mm 2 wait.

[0042] In this exemplary embodiment, as Figure 1-8As shown, the battery box 2 also includes a reinforcing beam 10, which divides the internal storage space 9 of the battery box 2 into a first storage space 91 and a second storage space 92. The battery pack 1 is located in the first storage space 91, and the sensor assembly 4 is located in the second storage space 92. This exemplary embodiment places the sensor assembly 4 and the battery pack 1 in different storage spaces, thereby avoiding mutual interference between them. Furthermore, electrical equipment such as the battery management system in the battery pack can also be located in the second storage space 92. That is, this exemplary embodiment places the sensor assembly 4 and the battery management system in the same space, eliminating the need for a separate storage space for the sensor assembly 4. This arrangement improves the internal space utilization of the battery pack and increases its energy density.

[0043] In this exemplary embodiment, as Figure 1-8 As shown, sensor assembly 4 may include one or more of the following: hydrogen sensor, carbon dioxide sensor, carbon monoxide sensor, smoke sensor, air pressure sensor, leak sensor, and temperature sensor.

[0044] In this exemplary embodiment, as Figure 6 As shown, the battery pack also includes a buffer pad 12, which is disposed between the support plate 21 and the base plate 22. The buffer pad 12 can prevent direct collision between the support plate 21 and the base plate 22. The buffer pad 12 can be an elastic structure, for example, the buffer pad 12 can be made of foam material, and the buffer pad 12 can be bonded to the support plate or the base plate. In this exemplary embodiment, the buffer pad 12 will occupy part of the space of the exhaust channel 3. In this exemplary embodiment, M needs to be set larger to meet the exhaust speed. Accordingly, 0.001≤L / M≤0.048. For example, L / M can be equal to 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.048, etc.

[0045] In this exemplary embodiment, as Figure 1-8As shown, the support plate 21 can be a cold plate with liquid cooling channels formed inside. The cold plate is bonded to the bottom of the battery pack 1. The cold plate can dissipate heat from the battery pack 1, thereby improving the safety and stability of the battery pack. In addition, the cold plate can also dissipate heat from the high-temperature material ejected from the pressure relief valve, thereby preventing the expansion of the battery thermal runaway range. In this exemplary embodiment, the cold plate is relatively thick. A thicker cold plate will compress the height of the exhaust channel. In this exemplary embodiment, M needs to be set larger to meet the exhaust speed. Accordingly, 0.001 ≤ L / M ≤ 0.045. For example, L / M can be equal to 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.045, etc.

[0046] In this exemplary embodiment, as Figure 1-8 As shown, the distance A between the pressure relief hole 231 and the base plate 22 in the direction perpendicular to the base plate 22 is denoted as A. If A is too small, the electrolyte will spray out from the pressure relief hole 231 before the gas, causing serious damage and contamination to the external components of the battery box. If A is too large, the gas exhaust path is prolonged, which is not conducive to pressure relief. In this exemplary embodiment, 30mm ≤ A ≤ 200mm. For example, A can be equal to 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 120mm, 140mm, 160mm, 180mm, 200mm, etc.

[0047] In this exemplary embodiment, as Figure 1-8 As shown, the weak area 211 is a through hole formed on the support plate 21. It should be understood that in other exemplary embodiments, the weak area 211 may also be a structure that is easily damaged, such as a thinned portion.

[0048] In this exemplary embodiment, the battery can be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery can also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, etc.

[0049] It should be noted that a battery is the smallest unit, comprising a cell and an electrolyte, capable of electrochemical reactions such as charging and discharging. A cell refers to a unit formed by winding or laminating stacked portions, which include a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarities of the first and second electrodes can be interchanged. Both the first and second electrodes are coated with active materials.

[0050] In this exemplary embodiment, the battery can be a square battery, that is, the battery can be a square prism battery. A square prism battery mainly refers to a prism shape, but it is not strictly limited that each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, but can be rounded.

[0051] In other exemplary embodiments, the battery may also have any other structure. For example, the battery may be a cylindrical battery, and the battery casing of a cylindrical battery may include two circular end faces and a curved surface located between the two circular end faces.

[0052] The battery can be a stacked battery, which is not only convenient to assemble, but also allows for the production of longer batteries. Specifically, the cell is a stacked cell, which has a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator between the first and second electrodes, thereby stacking multiple pairs of first and second electrodes to form a stacked cell.

[0053] Alternatively, the battery can be a wound battery, in which a first electrode, a second electrode with the opposite electrical charge, and a separator disposed between the first and second electrodes are wound together to obtain a wound battery cell. In a wound battery, multiple stacked single-piece tabs can be formed by winding the same electrode.

[0054] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0055] The accompanying drawings in this disclosure only illustrate the structures involved in this disclosure; other structures can be referred to with common design. Unless otherwise specified, the embodiments and features described in these embodiments can be combined to obtain new embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

[0056] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is defined only by the appended claims.

Claims

1. A battery pack, characterized in that, The battery pack includes: A battery pack (1) comprising a plurality of batteries (11), wherein each battery (11) is provided with an explosion-proof valve (111); The battery box (2) includes a support plate (21), a bottom plate (22), and a frame (23). The frame (23) is arranged along the edge of the bottom plate (22) to form a receiving space (9) for accommodating the battery pack (1). The support plate (21) is located on the side of the battery (11) where the explosion-proof valve (111) is provided. The bottom plate (22) is located on the side of the support plate (21) away from the battery (11). The bottom plate (22) is opposite to the support plate (21) and spaced apart. An exhaust channel (3) is formed between the support plate (21) and the bottom plate (22). The support plate (21) has multiple weak areas (211) formed thereon. The orthographic projection of the explosion-proof valve (111) on the base plate (22) and the orthographic projection of the weak areas (211) on the base plate (22) overlap at least partially. One or more pressure relief holes (231) are formed on the frame (23) that connect the exhaust channel (3) and the outside of the battery box (2). The total area of ​​the one or more pressure relief holes (231) is M, where M is in mm. 2 ; The sensor assembly (4) includes a sensor probe (41), the space where the sensor probe (41) is located is connected to the exhaust channel (3), the shortest distance between the sensor probe (41) and the pressure relief hole (231) in the direction parallel to the base plate (22) is L, the unit of L is mm, and the ratio of L to M satisfies 0.001≤L / M≤0.

06.

2. The battery pack according to claim 1, characterized in that, The orthographic projection of the sensor probe (41) on the base plate (22) and the orthographic projection of the explosion-proof valve (111) on the base plate (22) do not overlap.

3. The battery pack according to claim 1, characterized in that, The frame (23) is a hollow structure, and the hollow structure of the frame (23) forms a cavity (5). The cavity (5) is connected to the exhaust channel (3), and the pressure relief hole (231) is connected between the outside of the battery box (2) and the cavity (5).

4. The battery pack according to claim 3, characterized in that, The cavity (5) and the exhaust channel (3) are connected by one or more vents (6), and the total area of ​​the vents (6) is greater than the total area of ​​the pressure relief hole (231).

5. The battery pack according to claim 4, characterized in that, The battery pack also includes: A flow guide (7) is located inside the battery box (2). A flow guide channel (8) is formed inside the flow guide (7). A first connection port (71) and a second connection port (72) connecting the flow guide channel (8) are also formed on the flow guide (7). The first connection port (71) is connected to the cavity (5), and the second connection port (72) is connected to the exhaust channel (3). The second connection port (72) forms the vent (6).

6. The battery pack according to claim 5, characterized in that, The flow guide (7) includes: A partition plate (73) is used to divide the flow channel (8) into a first flow channel (81) and a second flow channel (82). A flow opening (731) is formed on the partition plate (73) for connecting the first flow channel (81) and the second flow channel (82). The vent (6) is connected to the side of the second guide channel (82) away from the first guide channel (81), the first connection port (71) is connected to the side of the first guide channel (81) in the first direction, the distribution directions of the first guide channel (81) and the second guide channel (82) intersect with the first direction, and in a single guide member (7), the area of ​​the orthographic projection of the guide opening (731) on the base plate (22) is smaller than the area of ​​the orthographic projection of the vent (6) on the base plate (22).

7. The battery pack according to claim 6, characterized in that, The first flow channel (81) is located on the side of the second flow channel (82) away from the base plate (22). The sensor assembly (4) also includes a sensor body (42), which is disposed on the side of the flow guide (7) away from the base plate (22). The sensor probe (41) is at least partially located in the first flow channel (81).

8. The battery pack according to claim 5, characterized in that, The battery pack includes one or more of the flow guides (7), the flow guides (7) being located at the corner of the battery box (2) on one side of the base plate (22), and the one or more flow guides (7) include a first flow guide (701), and among all the flow guides (7), the second connection port (72) on the first flow guide (701) is closest to the pressure relief hole (231); Wherein, 0.0022≤L / M≤0.

06.

9. The battery pack according to claim 8, characterized in that, One or more of the flow guides (7) include a second flow guide (702), and among all the flow guides (7), the second connection port (72) on the second flow guide (702) is the farthest from the pressure relief hole (231); Wherein, 0.0018≤L / M≤0.

055.

10. The battery pack according to claim 9, characterized in that, The battery box (2) includes multiple corners on one side of the base plate (22), and each corner is provided with the flow guide (7); Where 0.0012≤L / M≤0.

05.

11. The battery pack according to claim 1, characterized in that, 500mm 2 ≤M≤3000mm 2 。 12. The battery pack according to claim 1, characterized in that, The battery box (2) also includes: A reinforcing beam (10) is used to divide the accommodating space (9) inside the battery box (2) into a first accommodating space (91) and a second accommodating space (92), wherein the battery pack (1) is located in the first accommodating space (91) and the sensor assembly (4) is located in the second accommodating space (92).

13. The battery pack according to claim 1, characterized in that, The sensor assembly (4) includes one or more of the following: hydrogen sensor, carbon dioxide sensor, carbon monoxide sensor, smoke sensor, air pressure sensor, leak sensor, and temperature sensor.

14. The battery pack according to claim 1, characterized in that, The battery pack also includes: A buffer pad is provided between the support plate (21) and the base plate (22), with a value of 0.001 ≤ L / M ≤ 0.

048.

15. The battery pack according to claim 1, characterized in that, The support plate (21) is a cold plate, and a liquid cooling channel is formed inside the cold plate. The cold plate is bonded to the bottom of the battery pack (1), and 0.001≤L / M≤0.

045.

16. The battery pack according to claim 1, characterized in that, The distance between the pressure relief hole (231) and the base plate (22) in the direction perpendicular to the base plate (22) is A, where 30mm≤A≤200mm.

17. The battery pack according to claim 1, characterized in that, The weak area (211) is a through hole formed on the support plate (21).

Images